... pumped hydroelectric storage or tidal power plants, where large water pumps are oper-ated reversibly as turbine generators.85 Electric Power Systems: A Conceptual Introduction, by Alexandra von ... carrying a voltage and current, it is in fact carrying electric power: a load could be connected to it, and the moving charges in the wirewould do physical work while traver sing that load, driven ... on the other hand, becomes increasingly ineffi-cient for large amounts of power. The reasoning here is the same as for transmissionlines: since power is the product of current and voltage, transmitting...